I've told him before that I can't handle us having that much time together, but I think he doesn't want to upset her or make her feel unwelcome by arranging for her to be with us fewer days in the week.
But I'll talk to him again. That is one of the major issues.
What is the deal in most triads? My fiance and I ostensibly went into this as a couple. That's not how it's functioning right now. When she is here, I feel like they are the couple. Which is very jarring. I want to be nice and not spoil anyone's fun. In this situation, when does my discomfort or what I want as far as their behavior trump what they want to do?